1943, and the spring of 1944, Scorton was host to No. 604 Squadron who arrived from RAF Ford in Hampshire and No. 56 Squadron from RAF Martlesham Heath. The squadrons flew Beaufighters and Typhoons respectively. In May 1944, the USAAF Ninth Air Force transferred two Northrup P-61 Black Widow night interceptor squadrons, No.s 422 and 425, to Scorton from RAF Charmy Down near Bath in Somerset, to train and fly with the RAF night fighter Operational Training Unit assigned there. Initially flying de Havilland Mosquitoes, their first P-61 arrived at Scorton in May 1944 and their first assignment was to chase night-flying V-1 "buzz bombs". Scorton was known as USAAF Station AAF-425 for security reasons by the USAAF during the war, and by which it was referred to instead of location. The Black Widows would be vectored to intercept approaching V-1s by ground control. Since the V-1 was a little faster than the P-61, the Black Widow had to approach the V-1 from behind and go into a slight dive in order to catch up with it. The first Black Widow V-1 "kill" took place on 16 July 1944, credited to pilot Herman Ernst and radar operator Edward Kopsel of the 422nd Night Fighter Squadron. One of the greatest dangers involved in killing V-1s was the possibility of getting too close to the flying bomb when one fired at it, running the risk of damage to their own plane if the bomb exploded when hit. After D-Day, the USAAF Black Widows moved to Advanced Landing Grounds at Maupertus (A-15) (422d NFS) near Cherbourg and Vannes (A-33N) (425th NFS) in Brittany France to intercept German night fighters and bombers attacking Allied positions. After the two American squadrons vacated the base, it was quiet again for a period before the site was transferred from Fighter Command to Balloon Command who used the site for storage. At the end of the war, the airfield was surplus to requirements, but was used first by No. 221 Maintenance Unit, and then with No. 91 Maintenance Unit, who vacated the site in 1952. Units No. 26 Squadron RAF (1944) – North American Mustang I No. 56 Squadron RAF (1944) – Supermarine Spitfire IX No. 122 Squadron RAF (1941–1942) – Supermarine Spitfire IIA, IIB and VB No. 130 Squadron RAF (1943) – Supermarine Spitfire VB No. 167 Squadron RAF (1942) – Supermarine Spitfire VB No. 219 Squadron